Minor tweak setup-service tool
Minor tweak setup-service tool

This patch revises setup-service tool to make it get default
region name from environment variables when setting up senlin
service.

Change-Id: I654905915ce47be4b73847ac0e99bcf5f60b79d2

openstack/senlin,stackforge/senlin,stackforge/senlin,openstack/senlin,tengqm/senlin-container,tengqm/senlin-container,openstack/senlin